Valentino Rossi admits Yamaha MotoGP teammate Maverick Vinales' session-topping laptime on the second day of 2019 pre-season testing was "unattainable" for him.
Vinales left it until the closing stages of Thursday's running to become the first rider of the Sepang test to dip beneath the 1m59s barrier, outpacing nearest rival Alex Rins by more than half a second.
His laptime of 1m58.897s was just shy of the unofficial track record set by then-Ducati rider Jorge Lorenzo this time a year ago in pre-season testing.
Rossi meanwhile was sixth-fastest, 0.728s off the pace set by Vinales.
"Obviously I used a very old tyre that did not allow me to make the laptime I could have done," said Rossi. "I think I could have done better, maybe a tenth, I would have been in the top three.
"It's a shame, because everyone [ahead of me in the standings] did a time attack, but Maverick was unattainable. I could never have done a similar laptime.
"But anyway, we are not doing the races today but trying to find a good feeling."
Rossi confirmed on Wednesday that Yamaha had chosen to only bring one type of engine to Sepang, and said Thursday's running was spent honing the M1's engine braking and electronics, as well sampling a new type of chassis aimed at improving rear grip.
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